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An auditor for a large oil corporation has taken a random sample of monthly credit card charges for 32 individual (non-corporate) accounts. She found a mean of $81.76. Assume that the population standard deviation is 48.2. A 98% confidence interval estimate for the population mean of individual credit card charges would be.
a. 81.76 ± 19.89
b. 81.76 ± 16.72
c. 81.76 ± 112.94
d. 81.76 ± 22.0
Students in the industrial statistics lab at ASU calculate a lot of confidence intervals on mu. Suppose all these CIs are independent of each other.
A IRS auditor randomly selects 3 tax returns from 57 returns of which 6 contains errors. What is the probability that she selects none of those containing errors?
Suppose that 51% of the women who gave birth at a certain hospital last year were over 30 years old, and that 39% were unmarried.
Which of the following statements is true regarding a nonparametric test?
Find out the following probabilities. Probability that exactly 27 items will be good.
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
It is estimated that 10 percent of those taking the quantitative methods portion of the CPA examination fail that section. Sixty students are taking the exam on Saturday.
Four students each received a raw score of 22 on a different test. Compute the z-score for the raw score value of 22 for each student, given information about the distributions of X values for each test.
However, due to the variability in the traffic situation every morning, the standard deviation of these commutes is 5 minutes. Jenn has to be at work by 8:30 A.M. every morning.
The National Turkey Association wants to experiment with three different feed mixtures for very young turkeys. Since no experience exists regarding the three mixtures, no assumptions can be made about the distribution of weights.
21 percent of the employees in a company have managerial positions, and 31 percent of the employees in the company have MBA degrees. Also, 66 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employee..
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